This paper describes the pilot study for the REAcH stimulator. 15 people who had chronic stroke used a two channel stimulator for hand opening and elbow extension triggered by movement of the arm. There was a significant improvement in hand function over the 12 week treatment period and the improvement was maintained 12 weeks after the treatment ended.
The full article is published in Neurorehabil Neural Repair 2011 Oct;25(8):774-80.
accelerometer_trigured_electrical_stimulation_for_reach_and_grasp_in_chronic_stroke_patients_a_pilot_study.pdf